Erna was forced to pull out of the Rock 'N' Roll Marathon, which took place on November 11 in San Antonio, Texas, after sustaining an unspecified injury.

Erna told The Pulse Of Radio earlier this year what his training regimen was like for the 26-mile run. "You run three days a week, and then on the fourth day, you up your mileage," he said. "You'll eventually get your long runs up to like 18, 19, 20 miles. So you never really go past 20 miles up until the marathon, and then you just go for it."

Erna went under the knife earlier this year to repair an old knee injury, although it's not clear if this new problem is related to that.

GODSMACK was forced to scrap most of a European tour this past summer after Erna came down with a throat infection that affected his singing.

He did recover in time to co-headline the Rockstar Energy Uproar Festival tour in August and September with SHINEDOWN and STAIND. GODSMACK will next appear on the five-day ShipRocked 2012 cruise, which will take off from Fort Lauderdale, Florida on November 27.

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